The enzyme 3-cyanoalanine hydratase () catalyzes the chemical reaction
This enzyme belongs to the family of lyases, specifically the hydro-lyases, which cleave carbon-oxygen bonds. The systematic name of this enzyme class is <small>L</small>-asparagine hydro-lyase (3-cyanoalanine-forming). Other names in common use include ò-cyanoalanine hydrolase, ò-cyanoalanine hydratase, ò-CNAla hydrolase, ò-CNA nitrilase, and <small>L</small>-asparagine hydro-lyase. This enzyme participates in cyanoamino acid metabolism.